$ git clone -n https://src.fedoraproject.org/rpms/vala.git /var/lib/mock/f40-build-804510-144543/root/chroot_tmpdir/scmroot/vala
Cloning into '/var/lib/mock/f40-build-804510-144543/root/chroot_tmpdir/scmroot/vala'...
$ git fetch origin df067c08fa21116bb8ad7b129f099ee03b6a775b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vala
 * [new ref]         df067c08fa21116bb8ad7b129f099ee03b6a775b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df067c0 Update to 0.56.16